A dual-mode band-pass filter (BPF) for the fifth generation (5G) N78 band applications is proposed based on a 2-layer low temperature cofired ceramic (LTCC) substrate. The proposed BPF is built with a square resonator and two pairs of open-stubs, which suppressed the 2nd-order and 3rd-order 27 and 21 dB, respectively. The proposed BPF not only achieved a size reduction of 50% compared with a single-mode implementation, but also possessed a non-orthogonal input/output (I/O) feeding style, which presents convenient interconnection and integration with neighboring devices. Moreover, the dual-mode BPF does not need a conventional disturbing element to excite two degenerate modes. Comparison and discussion are carried out as well.
2. Shin, K. R. and K. Eilert, "Compact low cost 5G NR n78 band pass filter with silicon IPD technology," Proc. 2018 IEEE 19th Wireless and Microwave Technology Conference (WAMICON), 1-3, 2018.
3. Okuyama, Y. S. S. and N. I. T. Takada, "5G radio performance and radio resource management specifications,", 2019.
4. Hu, W., T. Yoshimasu, and H. Liu, "A novel dual-mode square loop passband filter with second spurious passband suppression," Proc. IEEE International Conference on Communications, Circuits and Systems, Vol. 4, 2273-2276, 2006.
5. Jeon, B. K., H. Nam, K. C. Yoon, B. W. Jeon, Y. W. Kim, and J. C. Lee, "Design of a patch dual-mode bandpass filter with second harmonic suppression using open stubs," Proc. IEEE Asia-Pacific Microwave Conference, 1106-1109, 2010.
doi:10.1002/mop.23123
6. Kuan, H. and H.-Y. Pan, "Design of a dual-mode bandpass filter with wide stopband performance for GPS application," Microwave Opt. Technol. Lett., Vol. 50, No. 2, 445-447, 2008.
doi:10.1002/mop.27444
7. Karpuz, C. and A. K. Gorur, "A novel compact configuration for dual-mode microstrip resonators and dual-band bandpass filter applications," Microwave Opt. Technol. Lett., Vol. 55, No. 4, 775-779, 2013.
doi:10.1002/mop.32031
8. Zhu, J.-M., et al., "Compact high-selectivity tunable dual-mode filter with constant bandwidth by adopting frequency-dependent S-L coupling," Microwave Opt. Technol. Lett., Vol. 62, No. 1, 108-111, 2020.
doi:10.2528/PIERC19061708
9. Cheng, Y., C. Mei, and L. Zhu, "Design of dual-mode band-pass filter with novel perturbation elements ," Progress In Electromagnetics Research C, Vol. 96, 59-71, 2019.
10. Zhou, B., et al., "Wide upper stopband and nonorthogonal I/O feed dual-mode LTCC filter," Proc. IEEE International Symposium on Radio-Frequency Integration Technology (RFIT), 1-3, 2016.
11. AXIEM, , Applied Wave Research Corporation, El Segundo, CA.
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